I have modified example 6.16, but is the floor variable treated as a latent class in its own right (so I should ask for classes=5), or is it present throughout, in the overall model (so I should ask for classes=4).

Ideally, I want to compare the four growth patterns to "no use". If this is not possible, I can use the consistently low class instead, but I would like to know how the zeros are accounted for in two-part mixture growth models.

I hypothesize a class of zero throughout, so I have attempted to add a zero class for c#1. I am expected the other four classes to show different growth patterns, but a zero value for the first class throughout. Is this the correct syntax?